Process of making tap bushings



March 26, 1935 c c, GLADSON I 1,996,014

PROCESS OF MAKING TAP BUSHINGS Filed June 50, 1955 Sheets-Sheet 1 90 z.W v 4% I 45 I I I 13/ |NVENTOR ATTORNEYS March 26, 1935.

/MiiM f A ORNEY5 Fig. 1.

process. of forging tap I The :oltrj'ect of my" invention is: toform: a1 tap bushing, of small conventiondesign, as a forging.

It also the object M nty invention to provide an improved forgingprocess for producing a tap bushing or any forging wherein a centralmember of irregular contour is housed or cupped within a body member.

In the drawings: Fig. 1 is a vertical section through a tap bushinginstalled in the head of a drum by means of a welding operation.

= inventionreiates to irnprovementsn" Fig. 2 is a side elevation of apiece of forgeable material such as may be used in my forgingoperationto produce the tap bushing shown in Fig. 3 is a side elevation of theproduct of the Q first forging operation performed upon the piece Ivertical section.

of metal shown in Fig. 2.

Fig. 4 is a side elevation of the product of the second forgingoperation in my process, a portion of the product being broken away toexhibit a vertical median section.

Fig. 5 is a side elevation of the product shown in Fig. 4 after atrimming operation, aportion being broken away to exhibit the precisepoint of trim. V I

Fig. 6 is a vertical section through a portion of the product after thefourth or drawing operation, the body of the tap bushing'being shown inFig. 7 is a side elevation .of new bushing after thetrimming'operation'performed on the,

product shown in Fig. 6 and constituting the final forging operationprior to the machining operation which completes the product.

Fig. 8 is a perspective of the product shownin Fig. 5.

Fig. 9 is a somewhat diagrammatic view show ing the split die used inthe second forging operation used to produce'th'e product shown in Fig.4. T

Fig. 10 is a vertical section showing the product in the drawingoperation'between the upper and lower dies.

Like parts are designated by the same reference characters throughoutthe several views.

Tap bushings of the type shown in Fig. 1 have heretofore beenconstructed in somewhat the same configuration for installation woodenbeer barrels, however, such tap bushings have heretoforebeen case fromg'rayiron or other metal suitable to the problem prevailing in thewooden beer barrel industry. Such tap bush- 21mm.- 013.MAKING-'IARBUSHING beer barrel iistry wliierein-tap bushings arepreferably secured itoethebarrel b means-for a warning portion 21 cuppedin. the-shape indicated in Fig. 1 to provide a base flange 22- and abody flange 23 cupped around'th'e thimble 24 provided with an'ir'regularexterior configuration as shown most clearly in Fig. 8, the mostimportant feature of which is a head25 which has heretofore made theformation; of tap bushings'in a'forging operation impossible since ithas heretofore been considered that there was no method or process orapparatus for forging the thimble 24 with its head 25 withinthe cup ofthe body 21 of the tap bushing and still provide space for the removalof the forging die or dies used to shape the thimble. a I have solvedthe problem above stated by a.

series of forging, drawing and trimming operations which will now bedescribed.

Using a conventional type ,of-forgeable mate rial, as shown in Fig. 2, Iplace the hot material upon an ordinary plate die provided withadepression to receive a slug 26: whichis extruded from the -body*21 toform the material out of which the thimble 24 is later to be shaped.This is accomplished in what will be hereinafter termed the firstoperation. Adjacent. the plate die referred'to, upon the bed of thesame-hammer used in the first operation, I provide asplit die 2'7vshown, in open position in Fig. 9, which is used in what I shall termthe second operation which not only shapes the exterior configuration of.the'

thimble 24, but also shapes the body. 21 t0 pro-' duce the product shownin Fig.4-

It is in thissecond operation that the irregular contour of the thimble24 is shaped. This irregular contour includesa neck 28, a stop rib 29and a head 25 slotted marginally at 29' and die 27. V p Likewise, as tothe body 22, the split die pro'-' vides means for shaping the material,.asindi cated most clearly at 31 in Fig. 4, whereby to providesuflicient material to form the completed product in the latter stagesor operations of my process Excess stock in afin 32 is then in the thirdoperation,'shown mFig. 5, trimmed at 33 to preprovided with cam surfaces30. Complementary .die surfaces for these various portions of thecontour of the thimble 24 are found in the split I therefore have solvedthe problempf providing v a forged tap bushing '20 which includes a bodypare the work for adrawing operation, shown 7 bushingand thef p o'of'th'e'body 1121113623. 1

V 1 r This operation which will beltermed the fourth j or drawingoperation,'leaves'a 'fln 38 which-is" trimmed as indicated in Fi2l"7,-thi1s"1eaving' a in Fig. 10,'which produces the product shown in Fig.6. In this operationa male-die 34 with annular extension 35 maintainsthe .properspacing of the thimble and its head 25 with reference.

to the body flange 23am the female die 36 shapes the .exteriorof thetap'bushing'to provide'a satisv factory surface-"37 for-the innerfsirface of the This completes the for'gin tion formachining.

From the foregoing descriptionof the, product and process offorming' aforged tap bushing'gitwill be seen that the-irregularcontour'of 'thethimble 24 is accomplished in -a'separatepreliminary forging process or.series ofoperations] and that theidrawing operationshownin Fig, 10, ac-

complished ea succeedingnpfi fatiomhouses/the forged thimble in a cnpsuchthat the forging operation of the thimble cou Id not possibiy be"accomplished with the body flange 23in the 1 heretofore manufacturableby any of the processes position shown in Figs. 1,6, '1, andlog Ithereforerprovide a forged'tap bushing knownintheartc I'claim:

1. 'ThezprQcessjofforging atap inchid 7 ns ain c m mw immiore fi Finusplitldie v to form a central haded'thirnble and a' surroundingbodyjflange,"and a' final drawing operation to cupthe flange upwardlyaround the "thirnble and-thirn biehead;

p v 2.;The process of forging a tap bushing includ-J ingfla-ipreliniinary hammerblow upon a billet erations which place the aphushin'g in fcohdi l overa solid die tojform a body with a protuberenema second biow operation comprisingan extrusion of the protuberanceinto the irregular contour-ofga split die to form a'lheaded thimblewitha flangedibodm a trimming; operation, a drawing operation .to cupthe flange around the thimble and thimble head and: a trimming op-V

